fix for macos

core/unit_test/TestDeviceAndThreads.py

@@ -17,7 +17,7 @@
 
 import unittest
 import subprocess
-import os #psutil
+import platform #psutil
 
 PREFIX = "$<TARGET_FILE_DIR:Kokkos_CoreUnitTest_DeviceAndThreads>"
 EXECUTABLE = "$<TARGET_FILE_NAME:Kokkos_CoreUnitTest_DeviceAndThreads>"
@@ -32,15 +32,18 @@ def GetFlag(flag, *extra_args):
 
 def GetNumThreads(max_threads):
     #phys_cores_count = psutil.cpu_count(logical=False)
-    args = ['nproc', '--all'] #'sysctl', '-n', 'hw.physicalcpu_max']
-    if os.name == 'nt':
+    args = []
+    name = platform.system()
+    if name == 'Darwin':
+        args = ['sysctl', '-n', 'hw.physicalcpu_max']
+    elif name == 'Linux':
+        args = ['nproc', '--all']
+    else:
         args = ['wmic', 'cpu', 'get', 'NumberOfCores']
 
     result = subprocess.run(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     output = result.stdout.decode('utf-8')
     phys_cores_count = int(output)
-    print(phys_cores_count)
-
     looplist = [1] + [i*phys_cores_count for i in [1,2,3,4,5,6,7]]
     for x in looplist:
         if x >= max_threads: